*{
    box-sizing: border-box;
    list-style: none;
    text-decoration: none;
    margin: 0;
    padding: 0;
    font-family: "Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",Arial,sans-serif;
}
a:hover{
    text-decoration: none;
}
body{
  
    background: url('../img/backg.jpg');
    background-size: cover;
    background-position: 50% 0px;
    background-repeat: no-repeat;
    background-attachment:fixed
}